diff --git a/system/database/DB_query_builder.php b/system/database/DB_query_builder.php
index 5a86ce5..b88ec95 100644
--- a/system/database/DB_query_builder.php
+++ b/system/database/DB_query_builder.php
@@ -150,6 +150,13 @@
 	protected $qb_set			= array();
 
 	/**
+	 * QB data set for update_batch()
+	 *
+	 * @var	array
+	 */
+	protected $qb_set_ub			= array();
+
+	/**
 	 * QB aliased tables list
 	 *
 	 * @var	array
@@ -1886,7 +1893,7 @@
 
 		if ($set === NULL)
 		{
-			if (empty($this->qb_set))
+			if (empty($this->qb_set_ub))
 			{
 				return ($this->db_debug) ? $this->display_error('db_must_use_set') : FALSE;
 			}
@@ -1913,9 +1920,9 @@
 
 		// Batch this baby
 		$affected_rows = 0;
-		for ($i = 0, $total = count($this->qb_set); $i < $total; $i += $batch_size)
+		for ($i = 0, $total = count($this->qb_set_ub); $i < $total; $i += $batch_size)
 		{
-			if ($this->query($this->_update_batch($this->protect_identifiers($table, TRUE, NULL, FALSE), array_slice($this->qb_set, $i, $batch_size), $index)))
+			if ($this->query($this->_update_batch($this->protect_identifiers($table, TRUE, NULL, FALSE), array_slice($this->qb_set_ub, $i, $batch_size), $index)))
 			{
 				$affected_rows += $this->affected_rows();
 			}
@@ -1941,18 +1948,16 @@
 	 */
 	protected function _update_batch($table, $values, $index)
 	{
-		$index_escaped = $this->protect_identifiers($index);
-
 		$ids = array();
 		foreach ($values as $key => $val)
 		{
-			$ids[] = $val[$index];
+			$ids[] = $val[$index]['value'];
 
 			foreach (array_keys($val) as $field)
 			{
 				if ($field !== $index)
 				{
-					$final[$field][] = 'WHEN '.$index_escaped.' = '.$val[$index].' THEN '.$val[$field];
+					$final[$val[$field]['field']][] = 'WHEN '.$val[$index]['field'].' = '.$val[$index]['value'].' THEN '.$val[$field]['value'];
 				}
 			}
 		}
@@ -1965,7 +1970,7 @@
 				.'ELSE '.$k.' END, ';
 		}
 
-		$this->where($index_escaped.' IN('.implode(',', $ids).')', NULL, FALSE);
+		$this->where($val[$index]['field'].' IN('.implode(',', $ids).')', NULL, FALSE);
 
 		return 'UPDATE '.$table.' SET '.substr($cases, 0, -2).$this->_compile_wh('qb_where');
 	}
@@ -2002,7 +2007,10 @@
 					$index_set = TRUE;
 				}
 
-				$clean[$this->protect_identifiers($k2, FALSE, $escape)] = ($escape === FALSE) ? $v2 : $this->escape($v2);
+				$clean[$k2] = array(
+					'field'  => $this->protect_identifiers($k2, FALSE, $escape),
+					'value'  => ($escape === FALSE ? $v2 : $this->escape($v2))
+				);
 			}
 
 			if ($index_set === FALSE)
@@ -2010,7 +2018,7 @@
 				return $this->display_error('db_batch_missing_index');
 			}
 
-			$this->qb_set[] = $clean;
+			$this->qb_set_ub[] = $clean;
 		}
 
 		return $this;
@@ -2777,6 +2785,7 @@
 	{
 		$this->_reset_run(array(
 			'qb_set'	=> array(),
+			'qb_set_ub'	=> array(),
 			'qb_from'	=> array(),
 			'qb_join'	=> array(),
 			'qb_where'	=> array(),
diff --git a/system/database/drivers/pdo/pdo_driver.php b/system/database/drivers/pdo/pdo_driver.php
index c27607e..2da9cf3 100644
--- a/system/database/drivers/pdo/pdo_driver.php
+++ b/system/database/drivers/pdo/pdo_driver.php
@@ -311,52 +311,6 @@
 	// --------------------------------------------------------------------
 
 	/**
-	 * Update_Batch statement
-	 *
-	 * Generates a platform-specific batch update string from the supplied data
-	 *
-	 * @param	string	$table	Table name
-	 * @param	array	$values	Update data
-	 * @param	string	$index	WHERE key
-	 * @return	string
-	 */
-	protected function _update_batch($table, $values, $index)
-	{
-		$ids = array();
-		foreach ($values as $key => $val)
-		{
-			$ids[] = $val[$index];
-
-			foreach (array_keys($val) as $field)
-			{
-				if ($field !== $index)
-				{
-					$final[$field][] = 'WHEN '.$index.' = '.$val[$index].' THEN '.$val[$field];
-				}
-			}
-		}
-
-		$cases = '';
-		foreach ($final as $k => $v)
-		{
-			$cases .= $k.' = CASE '."\n";
-
-			foreach ($v as $row)
-			{
-				$cases .= $row."\n";
-			}
-
-			$cases .= 'ELSE '.$k.' END, ';
-		}
-
-		$this->where($index.' IN('.implode(',', $ids).')', NULL, FALSE);
-
-		return 'UPDATE '.$table.' SET '.substr($cases, 0, -2).$this->_compile_wh('qb_where');
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
 	 * Truncate statement
 	 *
 	 * Generates a platform-specific truncate string from the supplied data
diff --git a/system/database/drivers/pdo/subdrivers/pdo_cubrid_driver.php b/system/database/drivers/pdo/subdrivers/pdo_cubrid_driver.php
index 8377798..4eb7f0b 100644
--- a/system/database/drivers/pdo/subdrivers/pdo_cubrid_driver.php
+++ b/system/database/drivers/pdo/subdrivers/pdo_cubrid_driver.php
@@ -171,47 +171,6 @@
 	// --------------------------------------------------------------------
 
 	/**
-	 * Update_Batch statement
-	 *
-	 * Generates a platform-specific batch update string from the supplied data
-	 *
-	 * @param	string	$table	Table name
-	 * @param	array	$values	Update data
-	 * @param	string	$index	WHERE key
-	 * @return	string
-	 */
-	protected function _update_batch($table, $values, $index)
-	{
-		$ids = array();
-		foreach ($values as $key => $val)
-		{
-			$ids[] = $val[$index];
-
-			foreach (array_keys($val) as $field)
-			{
-				if ($field !== $index)
-				{
-					$final[$field][] = 'WHEN '.$index.' = '.$val[$index].' THEN '.$val[$field];
-				}
-			}
-		}
-
-		$cases = '';
-		foreach ($final as $k => $v)
-		{
-			$cases .= $k." = CASE \n"
-				.implode("\n", $v)."\n"
-				.'ELSE '.$k.' END), ';
-		}
-
-		$this->where($index.' IN('.implode(',', $ids).')', NULL, FALSE);
-
-		return 'UPDATE '.$table.' SET '.substr($cases, 0, -2).$this->_compile_wh('qb_where');
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
 	 * Truncate statement
 	 *
 	 * Generates a platform-specific truncate string from the supplied data
diff --git a/system/database/drivers/pdo/subdrivers/pdo_pgsql_driver.php b/system/database/drivers/pdo/subdrivers/pdo_pgsql_driver.php
index 9483d24..05b8350 100644
--- a/system/database/drivers/pdo/subdrivers/pdo_pgsql_driver.php
+++ b/system/database/drivers/pdo/subdrivers/pdo_pgsql_driver.php
@@ -326,13 +326,13 @@
 		$ids = array();
 		foreach ($values as $key => $val)
 		{
-			$ids[] = $val[$index];
+			$ids[] = $val[$index]['value'];
 
 			foreach (array_keys($val) as $field)
 			{
 				if ($field !== $index)
 				{
-					$final[$field][] = 'WHEN '.$val[$index].' THEN '.$val[$field];
+					$final[$val[$field]['field']][] = 'WHEN '.$val[$index]['value'].' THEN '.$val[$field]['value'];
 				}
 			}
 		}
@@ -340,12 +340,12 @@
 		$cases = '';
 		foreach ($final as $k => $v)
 		{
-			$cases .= $k.' = (CASE '.$index."\n"
+			$cases .= $k.' = (CASE '.$val[$index]['field']."\n"
 				.implode("\n", $v)."\n"
 				.'ELSE '.$k.' END), ';
 		}
 
-		$this->where($index.' IN('.implode(',', $ids).')', NULL, FALSE);
+		$this->where($val[$index]['field'].' IN('.implode(',', $ids).')', NULL, FALSE);
 
 		return 'UPDATE '.$table.' SET '.substr($cases, 0, -2).$this->_compile_wh('qb_where');
 	}
diff --git a/system/database/drivers/postgre/postgre_driver.php b/system/database/drivers/postgre/postgre_driver.php
index dfd87f9..51916fc 100644
--- a/system/database/drivers/postgre/postgre_driver.php
+++ b/system/database/drivers/postgre/postgre_driver.php
@@ -550,13 +550,13 @@
 		$ids = array();
 		foreach ($values as $key => $val)
 		{
-			$ids[] = $val[$index];
+			$ids[] = $val[$index]['value'];
 
 			foreach (array_keys($val) as $field)
 			{
 				if ($field !== $index)
 				{
-					$final[$field][] = 'WHEN '.$val[$index].' THEN '.$val[$field];
+					$final[$val[$field]['field']][] = 'WHEN '.$val[$index]['value'].' THEN '.$val[$field]['value'];
 				}
 			}
 		}
@@ -564,12 +564,12 @@
 		$cases = '';
 		foreach ($final as $k => $v)
 		{
-			$cases .= $k.' = (CASE '.$index."\n"
+			$cases .= $k.' = (CASE '.$val[$index]['field']."\n"
 				.implode("\n", $v)."\n"
 				.'ELSE '.$k.' END), ';
 		}
 
-		$this->where($index.' IN('.implode(',', $ids).')', NULL, FALSE);
+		$this->where($val[$index]['field'].' IN('.implode(',', $ids).')', NULL, FALSE);
 
 		return 'UPDATE '.$table.' SET '.substr($cases, 0, -2).$this->_compile_wh('qb_where');
 	}